Furnace



FURNACE N. F. EGLER Filed Oct. 16, 1922 july l5 1924.

.iv is, i924.

STATES NICKOLAS F. FSGLER, OF rCHICAGO, ILLINOIS.

FUR'NAOE.

Application-filed October 16, 1922. Serial No. 594,773.

To all who/mJ t may concern.'

Be it known that I, NIoKoLAs F. EGLER, a citizen of the United States,residi at Chicago, in the county of Cook and tate of Illinois, haveinvented a new and use-l io in ful Improvement in Furnaces, of which thefollowing is a specification.

This invention relates to furnaces and is particularly adapted to beused on reversopen-hearth steel furnaces although it wi l be readilyunderstood that it is equally adapted for use in continuous heatingfurnaces. The invention is fully described in the followingspecification and shown in `16 the. accompanying drawings in Which-Figure 1 shows a vertical longitudinal cross section of one end of anopen hearth furnace embodying the invention, and

Figure 2 is a similar view of a modified 20 form of the invention.

This furnace comprises a hearth 10, a roof 11, and a mixing port 12which communicates through` an air duet 13 which if desired may lead toany well known type of air re enerator.

Exten ing into the back of the mixing port 12 is a fuel mixing pipe ornozzle 14 which communicates with a source of oil supply through thepipe 15V and with a M source of combustible gas supply through the pipe16. These pipes are preferably under substantially the same pressure andare controlled by the valves 17 and 18 respectively.

t In operation, air is supplied tothe air duct 13 and oil or the like tothe pipe 15. Producer gas, coke oven gas, or the like is brought intothe mixing nozzle 14 and serves to spray the oil or powdered fuel intothe furnace chamber. With the pressure in the two pipes 15 and 16substantially equal, there is no tendency for the pressure in the nozzleto back urp into either pipe and cut off flow therethrough.

Heretofore it has been customary to use compressed air or steam forspraying fuel oil into the furnace with the result that when the furnaceis not up to the full melting temperature, the air or steam tends toretard ignition and combustion of the oil. As a resul-t some of theunburned products are carried throughv the furnace and are deposited onthe walls of the checkerwork of the regenerator (not shown). This istrue even though in some cases fuel gas vis also fed into the chamberalong side the fuel oil.

By using fuel gas for spraying or atomizing the fuel oil an intimatemixture of the two is obtained. The gas readily mixes with the air inthe port 12, and burns thereby igniting the fuel oil and producing itsearly combustion in the furnace chamber.

In Fig. 2 is shown a form of nozzle adapted for the use of powderedfuel. In this form powdered fuel is fed through the pipe 19 under aslight pressure to the larger pipe 20 when 'it is caught by fuel gasunder pressure issuing from the pipe 21 and blown into the mixing port12a when it mixes with air from the air duct 13a. It is not desirable.to use much pressure on the powdered fuel and hence the outlet 20 mustbe larger to prevent the higher pressure in the pipe 21 from backing upagainst the powdered fuel and preventing its passage into the mixingtube 20.

While I have shown and described certain embodiments of my invention, itis to be understood that it is capable of many modifications. Changestherefore,` in the construction and arrangement may be made withoutdeparting from the spirit and scope ofthe invention as disclosed in theappended claims, in which it is my intention to claim all noveltyinherent in my invention as broadly as possible in view of the priorart.

What I claim as new and desire to secure by Letters Patent is:

1. The process of operating a reversing open hearth furnace consistingof supplying air to the mixing port, supplying liquid fuel underpressure to a point adjacent said mixing port, supplying a combustiblegas under pressure to said point, mixing the gas and liquid fuelin aconfined space, and spray ing and directing the mixture into said mixingport.

l 2. The process of operatingl a furnace consisting of supplying air tot e mixing port, supplying liquid fuel under pressure to a pointadjacent said mixing port, supplyin Ya combustible gas under pressure tosai point, mixing the gas and liquid fuel in a tube, and spraying anddirecting the mixture into said mixing port the pressures of the as andlliquid fuel being substantially equal.

3. In a furnace, a mixin port, an air duct leading thereto, a nozzleirected into said mixing port, means for supplying combustible oil underpressure to said nozzle, and

means for mixing a combustible gas With-A said oil Within said nozzle sothat the gas serves to atomize the oil and to direct it into the mixingport, said nozzle being located entirely outside said mixing chamber.

4. In a furnace, a mixing port, an air duct leading thereto', a nozzledirected into said mixing port and being located outside the same, meansfor suppl ing combustible oil under pressure to said7 nozzle, means forsupplying a combustible gas to said nozzle so that the gas serves toatomize the oil. and means for varying the proportions of gas and oil.

5. In a furnace, a mixing port, an air duct leading thereto, a mixingtube directed toward said port, means for discharging a 'fuel gas underpressure into said tube, and means for feeding fuel to said tube so thatthe gas will cause the fuel t0 be sprayed into saidport.

6. The process of operating a furnace con- Leonesa sisting of supplyingpreheated air to the mixing port, supplying liquid fuel under pressureto a point adjacent said mixing port, supplying a combustible gas underpressure tto said point, mixing the gas and liquid fuel in a confinedspace, and spraying and directing the mixture into said furnace.

7. In a reversing open hearth furnace, a mixing port, an air ductconductin reheated air thereto, a nozzle directe into said mixin port,means for supplying com.

bustible oi under pressure to said nozzle, and means for mixing acombustible gas with said oil within said nozzle so that the gas servesto atomize the oil and to direct the mixture into the mixing port.

8. The process of operating a furnace consisting of supplying air to themixing port, supplying fuelv under pressure to a point adjacent saidmixing port, supplying a combustible gas under ressure to said point,mixing the gas and fuel in a confined space, and spraying and directingtheemixture into said mixing port.

N ICKOLAS F. EGLER.

